CN113960366A - A detection circuitry that soaks for photovoltaic inverter - Google Patents
A detection circuitry that soaks for photovoltaic inverter Download PDFInfo
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- CN113960366A CN113960366A CN202111192070.8A CN202111192070A CN113960366A CN 113960366 A CN113960366 A CN 113960366A CN 202111192070 A CN202111192070 A CN 202111192070A CN 113960366 A CN113960366 A CN 113960366A
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- 238000001514 detection method Methods 0.000 title claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000007654 immersion Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 24
- 238000012360 testing method Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000002791 soaking Methods 0.000 abstract description 5
- 230000001788 irregular Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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Abstract
The invention discloses a water immersion detection circuit for a photovoltaic inverter, which relates to the technical field of photovoltaic inverters and comprises an equivalent circuit part, a voltage detection part, a signal part and a control part, wherein the signal part is connected with the control part, the voltage detection part is connected with the control part, and the signal part and the voltage detection part are both connected with the equivalent circuit part. The invention adopts the matching of the equivalent circuit part, the voltage detection part, the signal part and the control part, and judges whether the photovoltaic inverter is soaked or condensed through the circuit, thereby effectively realizing the soaking fault detection of the inverter in real time, avoiding the problem that the working life of the inverter is seriously influenced by the condensed water accumulated in the machine, and simultaneously, the inverter is damaged and soaked due to the external factors such as irregular production, violent construction and the like, thereby increasing the reliability of products and ensuring the service life of the inverter.
Description
Technical Field
The invention relates to the technical field of photovoltaic inverters, in particular to a water immersion detection circuit for a photovoltaic inverter.
Background
With the continuous development of fossil fuels, non-renewable energy sources are gradually exhausted, and in recent years, new energy power generation technology is more and more emphasized. The inverter is used as a core power electronic device for converting renewable energy into electric energy, and has wide application prospect.
The grid-connected inverter is a converter which converts direct current electric energy (batteries and storage batteries) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current, and the output alternating current is directly or indirectly connected to a power grid.
The following problems exist in the prior art:
present photovoltaic inverter accomplishes IPX 6's water repellent mostly structurally, carry out the detection that the inverter soaked very little, and IPX 6's photovoltaic inverter generally uses in the open air, the operational environment of inverter itself is just abominable relatively, work daytime in addition, the machine generates heat, shut down evening, the interior temperature of machine is lower, make the inside condensation ponding of machine, seriously influence inverter working life, and simultaneously, because of non-standard production, external factors such as violent construction also can make the inverter be damaged the soaking.
Disclosure of Invention
The invention provides a water immersion detection circuit for a photovoltaic inverter, which aims to have the characteristic of water immersion detection of the photovoltaic inverter and solve the problems that the working environment of the inverter is relatively severe, the inverter works in the daytime, the machine generates heat, stops at night, the temperature in the machine is low, the interior of the machine is condensed and accumulated with water, the service life of the inverter is seriously influenced, and meanwhile, the inverter is damaged and immersed due to external factors such as irregular production, violent construction and the like.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a detection procedure that soaks detection circuit for photovoltaic inverter, includes equivalent circuit part, voltage detection part, signal part and control part, the signal part is connected with the control part, voltage detection part is connected with the control part, signal part, voltage detection part all are connected with equivalent circuit part, this a detection procedure that soaks detection circuit for photovoltaic inverter divide into following step:
step one, electrifying a system, and starting a program;
step two, entering a self-checking state I;
entering a self-checking state II;
and step four, entering a formal detection state.
The technical scheme of the invention is further improved as follows: the second step comprises the following steps: the control part sends a long high level, keeps for a time T1, detects the voltage value of U1, compares the U1 sampling value in the control part with a set first self-checking protection threshold value, if the sampling value is less than the first self-checking protection threshold value, the self-checking is not successful, the program is ended, and reports an error to the system, if the sampling value is more than the first self-checking protection threshold value, the program continues to execute.
The technical scheme of the invention is further improved as follows: the second step further comprises: when the sampled U1 value is judged to be in the preset range, if the U1 value is in the preset value, the self-test state two is entered, and if the U1 value is not in the preset value, the self-test is judged to be failed.
The technical scheme of the invention is further improved as follows: the third step comprises: the control part sends out a pulse waveform with a certain frequency and a certain duty ratio, keeps for a certain time T1, detects the voltage value of U1, compares the U1 sampling value in the program with a set second detection protection threshold value, if the sampling value is greater than the second self-detection protection threshold value, the self-detection is unsuccessful, the program is ended, and an error is reported to the system, and if the sampling value is less than the second self-detection threshold value, the self-detection is passed.
The technical scheme of the invention is further improved as follows: the third step further comprises: in determining whether the sampled U1 value is within the preset range, if the U1 value is within the preset value, "self test pass" is determined and the formal test state is entered, and if the U1 value is not within the preset value, "self test fail" is determined.
The technical scheme of the invention is further improved as follows: the fourth step comprises: the processor sends a long high level signal, reads a sampling value of the detection voltage U1 in real time, judges whether the detection value of the U1 is larger than a protection threshold value in real time in a program, if the detection value of the U1 is larger than the protection threshold value, no fault exists, if the detection value of the U1 is smaller than the protection threshold value, the fault is detected, and a system fault signal is reported.
The technical scheme of the invention is further improved as follows: the fourth step further comprises: in determining whether the sampled U1 value is within the preset range, if the U1 value is within the preset value, "normal" is determined, and if the U1 value is not within the preset value, "machine flooding" is determined.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:
1. the invention provides a water immersion detection circuit for a photovoltaic inverter, which adopts the matching of an equivalent circuit part, a voltage detection part, a signal part and a control part, judges whether the photovoltaic inverter is immersed in water or is condensed by a circuit, can effectively realize the water immersion fault detection of the inverter in real time, avoids the problems that the condensed water in the machine is accumulated and the service life of the inverter is seriously influenced, and simultaneously, the inverter is damaged and immersed due to external factors such as irregular production, violent construction and the like, thereby increasing the reliability of products and ensuring the service life of the inverter.
2. The invention provides a water immersion detection circuit for a photovoltaic inverter, which adopts the cooperation of a first self-checking state, a second self-checking state and a formal detection state, can effectively and reliably realize the water immersion fault detection of the inverter through a self-checking function, can ensure the accuracy of a detection result through the self-checking of the two states, and is low in cost, simple to realize and beneficial to popularization.
Drawings
Fig. 1 is a schematic view of the composition of the submergence detecting circuit of the present invention.
FIG. 2 is a diagram illustrating a self-test state according to the present invention.
FIG. 3 is a diagram illustrating a self-test state of the present invention.
FIG. 4 is a schematic diagram of the formal detection state of the present invention.
FIG. 5 is a software flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
example 1
As shown in fig. 1 to 5, the present invention provides a submergence detecting circuit for a photovoltaic inverter, which comprises an equivalent circuit part, a voltage detecting part, a signal part and a control part, wherein the signal part is connected with the control part, the voltage detecting part is connected with the control part, and both the signal part and the voltage detecting part are connected with the equivalent circuit part, and the detecting process of the submergence detecting circuit for the photovoltaic inverter is divided into the following steps:
step one, electrifying a system, and starting a program;
step two, entering a self-checking state I;
entering a self-checking state II;
and step four, entering a formal detection state.
In this embodiment, adopt the equivalent circuit part, the voltage detection part, signal portion, control section's cooperation, judge whether to soak or the condensation photovoltaic inverter through the circuit, the fault detection that soaks of effectual realization dc-to-ac converter in real time has avoided the inside condensation ponding of machine, seriously influence dc-to-ac converter life, and simultaneously, because of the production of lack of standardization, external factors such as violent construction also can make the dc-to-ac converter be damaged the problem of soaking, thereby increase product reliability, guarantee the life of dc-to-ac converter.
Example 2
As shown in fig. 1 to 5, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the second step comprises: the control part sends a high level, keeps for a time T1, detects the voltage value of U1, compares the U1 sampled value in the control part with a set first self-checking protection threshold value, if the sampled value is less than the first self-checking protection threshold value, the self-checking is not successful, the program is ended, and reports an error to the system, if the sampled value is greater than the first self-checking protection threshold value, the program continues to execute, and the second step also comprises: when the sampled U1 value is judged to be in the preset range, if the U1 value is in the preset value, the self-test state two is entered, and if the U1 value is not in the preset value, the self-test is judged to be failed.
In this embodiment, the second step is a first self-test state, where the digital IO port sends a long high level, the long high level passes through the signal processing unit to amplify the signal to Ui _01, and at this time, the capacitor C1 in fig. 1 is in an off state in a dc state, which is equivalent to fig. 2 in a circuit, and according to a voltage equation, U1_01= Ui _01 _ R2/(R1+ R2) can be obtained, and at this time, the voltage sampling puts the sampled U1_01 data into the voltage detection portion, and the voltage detection portion processes the signal and sends it to the ADC sampling, and the control portion determines whether the sampled U1_01 value is within a preset range.
A: if the U1_01 value is within the preset value, the next link is entered (self-checking state two);
b: if the value of U1_01 is not within the preset value, it is determined that the self test failed.
Example 3
As shown in fig. 1 to 5, on the basis of embodiment 1, the present invention provides a technical solution: preferably, step three comprises: the control part sends out a pulse waveform with a certain frequency and a certain duty ratio, keeps for a certain time T1, detects the voltage value of U1, compares the U1 sampling value in the program with a set second detection protection threshold value, if the sampling value is greater than the second self-checking protection threshold value, the self-checking is unsuccessful, the program is ended, and reports an error to the system, if the sampling value is less than the second self-checking threshold value, the self-checking is passed, and the third step further comprises: in determining whether the sampled U1 value is within the preset range, if the U1 value is within the preset value, "self test pass" is determined and the formal test state is entered, and if the U1 value is not within the preset value, "self test fail" is determined.
In this embodiment, the third step is a self-test state two, at this time, the digital IO port sends a high-frequency level (high-frequency signal) with a certain frequency and duty ratio, the high-frequency level passes through the signal processing unit, and amplifies the signal to Ui _02, at this time, the capacitor C1 in fig. 1 is in a short-circuit state in the high-frequency state, which is equivalent to fig. 3 in the circuit, according to a voltage equation, U1_02= (Ui _02 × (R2// R3)/(R1+ R2// R3) can be obtained, at this time, the voltage sampling puts the sampled U1_02 data into the voltage detection portion, the voltage detection portion processes the signal and sends the signal to the ADC sampling, and the control portion determines whether the sampled U1_02 value is within a preset range.
A: if the U1_02 value is within the preset value, judging that the self-detection is passed and entering the next link (formal detection state);
b: if the U1_02 value is not within the preset value, it is determined that the self test failed.
Example 4
As shown in fig. 1 to 5, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the step four includes: the processor sends out long high level signals, and reads the sampling value of the detection voltage U1 in real time, real-time judges whether the U1 detection value is larger than the protection threshold value in the program, if so, no fault exists, if smaller than the protection threshold value, a fault is detected, and a system fault signal is reported, the fourth step further comprises: in determining whether the sampled U1 value is within the preset range, if the U1 value is within the preset value, "normal" is determined, and if the U1 value is not within the preset value, "machine flooding" is determined.
In this embodiment, the fourth step is a formal detection state, at this time, the digital IO port sends a medium-high frequency level (medium-high frequency signal) with a certain frequency (smaller than that in fig. 3) and a duty ratio, the medium-high frequency level passes through the signal processing unit, and amplifies the signal to Ui _03, at this time, the C1 capacitor in fig. 1 is in an impedance state in the medium-high frequency state, the equivalent impedance is Rw, and is equivalent to fig. 4 in the circuit, according to a voltage equation, U1_03= [ Ui _03 × R2// (R3+ Rw) ]/[ R1+ R2// (R3+ Rw) ] can be obtained, at this time, the voltage sampling puts the sampled U1_03 data to the voltage detection portion, the voltage detection portion processes the signal and sends the signal to the ADC sampling, and the control portion determines whether the sampled U1_03 value is within a preset range.
A: if the U1_03 value is within the preset value, judging normal;
b: if the U1_03 value is not within the preset value, it is determined that the machine is flooded.
In conclusion, the invention adopts the matching of the equivalent circuit part, the voltage detection part, the signal part and the control part, and judges whether the photovoltaic inverter is soaked or condensed through the circuit, so that the soaking fault detection of the inverter can be effectively realized in real time, the phenomenon that the working life of the inverter is seriously influenced by condensed water in the machine is avoided, and meanwhile, the problem that the inverter is damaged and soaked due to external factors such as irregular production, violent construction and the like is solved, so that the reliability of products is improved, the service life of the inverter is ensured, the soaking fault detection of the inverter can be effectively and reliably realized through the self-checking function by adopting the matching of the first self-checking state, the second self-checking state and the formal detection state, and the accuracy of detection results can be ensured through the self-checking of the two states.
The present invention has been described in general terms in the foregoing, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Therefore, modifications or improvements are within the scope of the invention without departing from the spirit of the inventive concept.
Claims (7)
1. A detection circuit soaks for photovoltaic inverter, includes equivalent circuit part, voltage detection part, signal part and control section, its characterized in that: the detection process of the water immersion detection circuit for the photovoltaic inverter is divided into the following steps:
step one, electrifying a system, and starting a program;
step two, entering a self-checking state I;
entering a self-checking state II;
and step four, entering a formal detection state.
2. The submergence detecting circuit for a photovoltaic inverter according to claim 1, characterized in that: the second step comprises the following steps: the control part sends a long high level, keeps for a time T1, detects the voltage value of U1, compares the U1 sampling value in the control part with a set first self-checking protection threshold value, if the sampling value is less than the first self-checking protection threshold value, the self-checking is not successful, the program is ended, and reports an error to the system, if the sampling value is more than the first self-checking protection threshold value, the program continues to execute.
3. The submergence detecting circuit for a photovoltaic inverter according to claim 2, characterized in that: the second step further comprises: when the sampled U1 value is judged to be in the preset range, if the U1 value is in the preset value, the self-test state two is entered, and if the U1 value is not in the preset value, the self-test is judged to be failed.
4. The submergence detecting circuit for a photovoltaic inverter according to claim 1, characterized in that: the third step comprises: the control part sends out a pulse waveform with a certain frequency and a certain duty ratio, keeps for a certain time T1, detects the voltage value of U1, compares the U1 sampling value in the program with a set second detection protection threshold value, if the sampling value is greater than the second self-detection protection threshold value, the self-detection is unsuccessful, the program is ended, and an error is reported to the system, and if the sampling value is less than the second self-detection threshold value, the self-detection is passed.
5. The submergence detecting circuit for a photovoltaic inverter according to claim 4, characterized in that: the third step further comprises: in determining whether the sampled U1 value is within the preset range, if the U1 value is within the preset value, "self test pass" is determined and the formal test state is entered, and if the U1 value is not within the preset value, "self test fail" is determined.
6. The submergence detecting circuit for a photovoltaic inverter according to claim 1, characterized in that: the fourth step comprises: the processor sends a long high level signal, reads a sampling value of the detection voltage U1 in real time, judges whether the detection value of the U1 is larger than a protection threshold value in real time in a program, if the detection value of the U1 is larger than the protection threshold value, no fault exists, if the detection value of the U1 is smaller than the protection threshold value, the fault is detected, and a system fault signal is reported.
7. The submergence detecting circuit for a photovoltaic inverter according to claim 6, characterized in that: the fourth step further comprises: in determining whether the sampled U1 value is within the preset range, if the U1 value is within the preset value, "normal" is determined, and if the U1 value is not within the preset value, "machine flooding" is determined.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111192070.8A CN113960366A (en) | 2021-10-13 | 2021-10-13 | A detection circuitry that soaks for photovoltaic inverter |
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| CN202111192070.8A CN113960366A (en) | 2021-10-13 | 2021-10-13 | A detection circuitry that soaks for photovoltaic inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114578732A (en) * | 2022-03-02 | 2022-06-03 | 中国船舶重工集团公司第七0七研究所九江分部 | Device and method for detecting accidental water inflow of electronic equipment by utilizing CAN bus |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614573A (en) * | 2009-04-28 | 2009-12-30 | 北京宝力马传感技术有限公司 | Soaking monitoring method, device and equipment |
| CN206618989U (en) * | 2017-02-16 | 2017-11-07 | 漳州立达信光电子科技有限公司 | A kind of anti-interference detection circuit of water sensor |
| CN108896613A (en) * | 2018-04-16 | 2018-11-27 | 华为技术有限公司 | Water logging detection device and method |
| CN208424317U (en) * | 2018-06-13 | 2019-01-22 | 上能电气股份有限公司 | A kind of condensation-preventing device for photovoltaic system |
| CN212539271U (en) * | 2020-08-04 | 2021-02-12 | 杭州格创新能源有限公司 | Condensation water immersion alarm |
| CN214337772U (en) * | 2020-12-16 | 2021-10-01 | 宁波尚唯斯智能科技有限公司 | Waterproof structure of photovoltaic inverter |
-
2021
- 2021-10-13 CN CN202111192070.8A patent/CN113960366A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614573A (en) * | 2009-04-28 | 2009-12-30 | 北京宝力马传感技术有限公司 | Soaking monitoring method, device and equipment |
| CN206618989U (en) * | 2017-02-16 | 2017-11-07 | 漳州立达信光电子科技有限公司 | A kind of anti-interference detection circuit of water sensor |
| CN108896613A (en) * | 2018-04-16 | 2018-11-27 | 华为技术有限公司 | Water logging detection device and method |
| CN208424317U (en) * | 2018-06-13 | 2019-01-22 | 上能电气股份有限公司 | A kind of condensation-preventing device for photovoltaic system |
| CN212539271U (en) * | 2020-08-04 | 2021-02-12 | 杭州格创新能源有限公司 | Condensation water immersion alarm |
| CN214337772U (en) * | 2020-12-16 | 2021-10-01 | 宁波尚唯斯智能科技有限公司 | Waterproof structure of photovoltaic inverter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114578732A (en) * | 2022-03-02 | 2022-06-03 | 中国船舶重工集团公司第七0七研究所九江分部 | Device and method for detecting accidental water inflow of electronic equipment by utilizing CAN bus |
| CN114578732B (en) * | 2022-03-02 | 2023-09-12 | 中国船舶重工集团公司第七0七研究所九江分部 | Detection device and method for carrying out accidental water inflow of electronic equipment by using CAN bus |
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